I have a 1980 Tamron 80 mm to 210 mm telephoto (zoom) lens that I intend to use for astrophotography. I could not find a dedicated astro camera adapter for this particular lens so I just improvised one. I used epoxy to connect a Tamron to Canon EOS adapter and an M42 connector for my ASI 533 astro camera.
After several imaging sessions with the Lagoon and Veil Nebula, the DIY adapter appears to work.
Related links:
Universal Camera Adapter
DSLR to Telescope Adapter
Night Sky in Focus © Anthony Urbano | Bacoor, Philippines
Night Sky in Focus 